[Code of Federal Regulations] [Title 40, Volume 13] [Revised as of July 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 40CFR63.7111] [Page 41] TITLE 40--PROTECTION OF ENVIRONMENT CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) PART 63_NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES--Table of Contents Subpart AAAAA_National Emission Standards for Hazardous Air Pollutants for Lime Manufacturing Plants Sec. 63.7111 When must I conduct subsequent performance tests? You must conduct a performance test within 5 years following the initial performance test and within 5 years following each subsequent performance test thereafter.